Private treaty sales – Occasionally, when looking at an auction catalogue some of the items have been withdrawn. Usually these goods have been sold by 'private treaty'. This means that the goods have already been sold off, usually to a trader or dealer on a private, behind-the-scenes basis before they have had a chance to be offered at the auction sale. These goods are rarely in single lots – photocopiers or fax machines would generally be sold in bulk lots.
At the close of an auction, Treasury awards all noncompetitive bids that comply with the auction rules and then accepts competitive bids in ascending order of their rate, yield, or discount margin (lowest to highest) until the quantity of awarded bids reaches the offering amount. All bidders will receive the same rate, yield, or discount margin at the highest accepted bid.
Silent auction is a variant of the English auction in which bids are written on a sheet of paper. At the predetermined end of the auction, the highest listed bidder wins the item.[43] This auction is often used in charity events, with many items auctioned simultaneously and "closed" at a common finish time.[43][44] The auction is "silent" in that there is no auctioneer selling individual items,[43] the bidders writing their bids on a bidding sheet often left on a table near the item.[45] At charity auctions, bid sheets usually have a fixed starting amount, predetermined bid increments, and a "guaranteed bid" amount which works the same as a "buy now" amount. Other variations of this type of auction may include sealed bids.[43] The highest bidder pays the price he or she submitted.[43]

The District of Columbia now auctions its surplus property online through GovDeals, a Liquidity Services, Inc. marketplace. The district awarded the contract for the management of the inventory, appraisal, sale and shipping of the city's surplus property to Liquidity Services Inc. LSI conducts auctions of city assets such as vehicles, police automobile accessories, computer equipment, radios and other communications equipment, office furniture and other supplies through its online marketplace. The auctions are expected to improve data tracking and financial oversight of the city's surplus asset disposition activities.